CN101823856B - Copper-free ceramic friction material with little falling ash and preparation method thereof - Google Patents
Copper-free ceramic friction material with little falling ash and preparation method thereof Download PDFInfo
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- CN101823856B CN101823856B CN 201010181427 CN201010181427A CN101823856B CN 101823856 B CN101823856 B CN 101823856B CN 201010181427 CN201010181427 CN 201010181427 CN 201010181427 A CN201010181427 A CN 201010181427A CN 101823856 B CN101823856 B CN 101823856B
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Abstract
The invention discloses a copper-free ceramic friction material with little falling ash and a preparation method thereof. The copper-free ceramic friction material with little falling ash is prepared by mixing, shaping and thermally processing the following raw materials in percentage by weight: 5 to 14 percent of adhesive, 20 to 45 percent of reinforcing material, 10 to 40 percent of ceramic material, 10 to 18 percent of lubricant and the balance of filler, wherein nitrile rubber modified phenolic resin and nitrile rubber powder are used as the adhesive; the reinforcing material is one or a mixture of more of aramid fiber, carbon fiber, steel fiber, foam iron powder and aluminum oxide fiber; the ceramic material is one or a combination of more of molybdenum disulfide, magnesium oxide and ferrous disulphide; the lubricant is the mixture of graphite and mica; and the filler is the mixture of composite filler, barite, friction powder and aluminum powder. The material has high friction performance, low brake noise and high heat fading resistance, and particularly shows high performance in aspects of wear resistance, long life and great reduction in the falling ash of a wheel hub; therefore, the material can meet both the requirement of a modern automobile braking system on operating conditions and the requirement on economy and environment friendliness when an automobile is used.
Description
Technical field
The present invention relates to a kind of friction materials, particularly relate to a kind of copper-free ceramic friction material with little falling ash for vehicle or braking system of engineering machinery, excellent frictional behaviour and physical strength are arranged when high temperature.
Background technology
Non-asbestos-based friction material has become main flow, and multiple alternative fiber is widely adopted, and as in order to improve intensity, guarantees frictional coefficient and improves quality, has adopted in a large number steel fiber, such as steel fiber, and copper fiber etc.Non-asbestos-based friction material now generally contains 0～20% copper fiber or copper powder.Copper is for increasing intensity, improves frictional coefficient, and the frictional coefficient when further keeping 400 ℃, improves heat-conduction coefficient.Different with steel fiber is that the more difficult antithesis of hindering of copper does not namely increase the abrasion loss of mating plate retarding disc, and causes getting rusty.In addition, except fibre fractionation, also used frictional behaviour and regulated component and bonding component, as the antimony sulfide that contains heavy metal antimony is often used as frictional behaviour and regulates component.In non-asbestos-based friction material, the compound of antimony such as antimony sulfide or weisspiessglanz, increases oilness and flame retardant resistance when high temperature.Yet in recent years owing to feature of environmental protection requirement, the friction materials that American-European countries requires to use does not contain heavy metal.Not containing the friction materials of heavy metal such as copper or antimony and existing friction materials, to reach same performance requriements be necessary in future, but for copper base friction material, also not find now equivalent material.In order to replace copper base friction material, traditional practice is the semimetal friction material that uses steel fiber to strengthen, and but exists all the time and hinders antithesis and problem of rustiness.
Summary of the invention
First technical problem to be solved by this invention provide a kind of high temperature friction performance that can satisfy motor vehicle braking system and requirement of mechanical strength and wheel hub fall ash less, the copper-free ceramic friction material with little falling ash of environmental protection.
Second technical problem to be solved by this invention provides the preparation method of this copper-free ceramic friction material with little falling ash.
In order to solve the problems of the technologies described above, copper-free ceramic friction material with little falling ash provided by the invention, the weight percent of its component is: binding agent 5～14, adopt nbr modified phenolic resins and acrylonitrile-butadiene rubber powder; Strongthener 20～45, the mixing of one or more of employing aramid fiber, carbon fiber, steel fiber, foam ferrous powder and sapphire whisker; Ceramic-like materials 10～40 adopts one or more the combination of molybdenumdisulphide, magnesium oxide and ferrous disulfide; Lubricant 10～18, the mixture of employing graphite, mica; The filler surplus comprises the mixture of compounded mix, barite, friction powder and aluminium powder.
Wherein used a certain amount of and a certain proportion of magnesium oxide and graphite, its ratio is 1: 1 to 3: 1.Magnesium oxide is comparatively soft ceramic particle, and dish is not had aggressiveness, has high heat conductivity.Can use activated magnesia and electrically molten magnesia, it is 10～400 μ m that median size is selected in suggestion, and optimum range is 50～200 μ m.Frictional coefficient when graphite can be kept 400 ℃ has certain effect to guaranteeing oilness and heat conductivity, and particle size range is 50～150 μ m.
Its material prescription count by weight percentage into:
Nbr modified phenolic resins 3～8, acrylonitrile-butadiene rubber powder 2～6,
Aramid fiber 1～5, steel fiber 5～20,
Mica 3～8, sapphire whisker 3～5,
Compounded mix 2～8, organic friction powder 2～8,
Preparation provided by the invention comprises the steps: without the method for copper little falling ash porcelain Automotive Friction Material
(1) batching: by each component materials of said ratio weighing;
(2) batch mixing: load weighted each material is dropped in the high speed mixer, and mixing time 2～3 minutes gets pulverulent mixture;
(3) moulding: take by weighing compound by the brake facing model, pour in the hot-die, pressing pressure 180～300kgf/cm2,160～190 ℃ of hot pressing temperatures, exhaust 3～8 times, the dwell time decides according to the thickness of brake facing, generally is 55～65s/mm;
(4) thermal treatment: brake facing was warmed up to 160 ℃ at 2 hours from room temperature, is incubated 4 hours, be warmed up to 200 ℃ at 1 hour again, be incubated 4 hours, then cool to room temperature with the furnace;
(5) the above-mentioned product that makes is carried out plain grinding, chamfering, fluting by technical requirements, then under 500～550 ℃ temperature, carry out 2 minutes surface treatment, through spraying, marking, be processed into automobile brake sheet again.
Adopt copper-free ceramic friction material with little falling ash of technique scheme and preparation method thereof, do not contain asbestos, heavy metal copper and antimony, have the following advantages with respect to the friction materials of the heavy metals such as traditional cupric and antimony:
1, more meets the environment-friendly type requirement, the secondary pollution of having avoided heavy metal to cause after with friction dust entered environment;
2, through the detection of 3000 type performance Bench Test Systems and the NVH3900 type noise test platform system in LINK laboratory, has good frictional behaviour, heat resistanceheat resistant decline performance is good, brake noise is low, and particularly falling in wear-resistant, long lifetime and to wheel hub has shown superior performance aspect a large amount of minimizings of ash.
3, technique is simple, is suitable for suitability for industrialized production, has good economic and social benefit.
In sum, the present invention has good frictional behaviour, brake noise is low and heat resistanceheat resistant decline performance is good, particularly fall in wear-resistant, long lifetime and to wheel hub and shown superior performance aspect a large amount of minimizings of ash, can satisfy the requirement of Hyundai Motor breaking system applying working condition, and meet the requirement of the economic environmental protection of automobile use.
Description of drawings
Fig. 1 is brake efficiency one figure;
Fig. 2 is brake efficiency two figure;
Fig. 3 is brake efficiency three figure;
Fig. 4 is brake efficiency four figure;
Fig. 5 is the usefulness synoptic diagram;
Fig. 6 is the decline synoptic diagram.
Embodiment
Copper-free ceramic friction material with little falling ash, the weight percent of its component is: binding agent 5～14, adopt nbr modified phenolic resins and acrylonitrile-butadiene rubber powder; Strongthener 20～45, the mixing of one or more of employing aramid fiber, carbon fiber, steel fiber, foam ferrous powder and sapphire whisker; Ceramic-like materials 10～40 adopts one or more the combination of molybdenumdisulphide, magnesium oxide and ferrous disulfide; Lubricant 10～18, the mixture of employing graphite, mica; The filler surplus comprises the mixture of compounded mix, barite, friction powder and aluminium powder.
Wherein used a certain amount of and a certain proportion of magnesium oxide and graphite, its ratio is 1: 1 to 3: 1.Magnesium oxide is comparatively soft ceramic particle, and dish is not had aggressiveness, has high heat conductivity.Can use activated magnesia and electrically molten magnesia, it is 10～400 μ m that median size is selected in suggestion, and optimum range is 50～200 μ m.Frictional coefficient when graphite can be kept 400 ℃ has certain effect to guaranteeing oilness and heat conductivity, and particle size range is 50～150 μ m.
Its material prescription count by weight percentage into:
Nbr modified phenolic resins 3～8, acrylonitrile-butadiene rubber powder 2～6,
Aramid fiber 1～5, steel fiber 5～20,
Mica 3～8, sapphire whisker 3～5,
Compounded mix 2～8, organic friction powder 2～8,
Preparation provided by the invention comprises the steps: without the method for copper little falling ash porcelain Automotive Friction Material
(1) batching: by each component materials of said ratio weighing;
(2) batch mixing: load weighted each material is dropped in the high speed mixer, and mixing time 2～3 minutes gets pulverulent mixture;
(3) moulding: take by weighing compound by the brake facing model, pour in the hot-die, pressing pressure 180～300kgf/cm2,160～190 ℃ of hot pressing temperatures, exhaust 3～8 times, the dwell time decides according to the thickness of brake facing, generally is 55～65s/mm;
(4) thermal treatment: brake facing was warmed up to 160 ℃ at 2 hours from room temperature, is incubated 4 hours, be warmed up to 200 ℃ at 1 hour again, be incubated 4 hours, then cool to room temperature with the furnace;
(5) the above-mentioned product that makes is carried out plain grinding, chamfering, fluting by technical requirements, then under 500～550 ℃ temperature, carry out 2 minutes surface treatment, through spraying, marking, be processed into automobile brake sheet again.
The invention will be further described below in conjunction with embodiment.
Example 1: take Honda Accord front wheel brake sheet as example
The starting material and the prescription that use see Table 1, suppress Honda Accord front wheel brake sheet and test with example friction materials 1-7 and contrast friction materials 8-9, wherein, have used steel fiber and foam ferrous powder among the 1-7, have used the copper fiber among the 8-9.Technique is: the starting material material evenly mixes, and weighs and pours compression molding in the mould into, and temperature is 155 ℃; Pressure is 13MPa; 8 minutes dwell times, exit 4 times; In heat treatment box, be warmed up to 160 ℃, be incubated 4 hours, in 1 hour, be warmed up to 200 ℃ again, be incubated 4 hours, then cool to room temperature with the furnace.
The tabulation of table 1 friction material formulation
A---resol; B---paracril; C---magnesium oxide; D---graphite;
E---magnesium oxide+graphite; F---steel fiber+foam ferrous powder;
G---compounded mix; H---molybdenumdisulphide; I---barite.
The brake facing that uses above-mentioned friction materials to make carries out wearing test at the bench testing machine, and test conditions is as follows:
Program: SAE J2707; Brake disk material: graphitic cast iron;
Test conditions sees Table 2:
The program that upper tabular goes out is 1 circulation, and 2 circulations are carried out in each test, and test item is frictional coefficient and abrasion loss, and the result provides in table 3:
Table 3 test-results
According to Japanese car industrial standards JASO C406-2000 No. 3 friction materialss are carried out performance test, the result as shown in Figure 1, Figure 2, Figure 3 and Figure 4.Carried out respectively the approval test of 50km/h, 100km/h and 130km/h, along with the increase of speed, the rising of temperature, frictional coefficient changes very steady; And frictional coefficient does not reduce during high-speed and high-temperature, shows a rising trend on the contrary, and velocity-dependent and temperature dependency are all very good; The braking ability performance is stable under different retarded velocity and pressure; Carry out the decline test of 100km/h, it is very little to fail, and restorability is good.
Embodiment 2: take Buick Lacrosse front wheel brake sheet as example
By percentage to the quality, without copper fall less the ash prescription as follows: nbr modified phenolic resins 8%, acrylonitrile-butadiene rubber powder 6%, aramid fiber 4%, steel fiber 10%, carbon fiber 5%, foam ferrous powder 10%, sapphire whisker 3%, magnesium oxide 24%, synthetic graphite 8%, mica 3%, molybdenumdisulphide 4%, barite 5%, aluminium powder 3%, ferrous disulfide 2%, compounded mix 2%, organic friction powder 2%.Above-mentioned starting material are evenly mixed, weigh and pour compression molding in the mould into, temperature is 165; Pressure is 13MPa; 10 minutes dwell times, exit 6 times; In heat treatment box, be warmed up to 160 ℃, be incubated 4 hours, in 1 hour, be warmed up to 220 again, be incubated 4 hours, then cool to room temperature with the furnace.Through machining, surface treatment is sprayed paint, and packing namely makes without the copper grey friction plate that falls less.
After testing, the usefulness frictional coefficient is between 0.38-0.44, and the heat fading rate is in 20%, wear rate is very little, and through above-mentioned SAE2707 wear test check, two circulation wear rates are at 1 mm, it is grey few to show in road test that simultaneously wheel hub falls, good endurance, with reference to the accompanying drawings.
The characteristics such as in sum, it is steady that copper-free ceramic friction material with little falling ash of the present invention has brake efficiency, and good wear resisting property, noise are lower, examination has good driving comfort through the entrucking road.Owing to do not contain heavy metal, have wheel hub and fall ash less and the characteristics of environmental protection, manufacturing cost is not high simultaneously, meets the requirement of modern automobile industry.
Claims (1)
1. copper-free ceramic friction material with little falling ash, the weight percent of its component is: binding agent 5～14, adopt nbr modified phenolic resins and acrylonitrile-butadiene rubber powder; Strongthener 20～45, the mixing of one or more of employing aramid fiber, carbon fiber, steel fiber, foam ferrous powder and sapphire whisker; Ceramic-like materials 10～40 adopts one or more the combination of molybdenumdisulphide, magnesium oxide and ferrous disulfide; Lubricant 10～18, the mixture of employing graphite, mica; The filler surplus, the mixture that comprises compounded mix, barite, friction powder and aluminium powder, described magnesium oxide uses activated magnesia and electrically molten magnesia, median size is 10～400 μ m, the particle size range of described graphite is 50～150 μ m, it is characterized in that: its material prescription count by weight percentage into:
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| CN109780101B (en) * | 2018-10-22 | 2022-06-21 | 泰明顿摩擦材料技术(上海)有限公司 | Copper-free friction material and preparation method thereof |
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